This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 117 |
| 3 | 1881 |
| 4 | 36051 |
| 5 | 805875 |
| 6 | 20661609 |
| 7 | 599319747 |
| 8 | 19443585048 |
| 9 | 698723462022 |
| 10 | 27583235473854 |
| 11 | 1187660855613822 |
| 12 | 55430739480692085 |
| 13 | 2789074498460404927 |
| 14 | 150571050665946174760 |
| 15 | 8684625004973955639293 |
| 16 | 533144024633105768180154 |